package com.gdth.widget.imageview;

import com.gdth.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.ImageView;

public class RoundImageView extends ImageView {
	private int mBorderThickness = 0;
	private Context mContext;
	private int defaultColor = 0xFFFFFFFF;
	// 外圆边框颜色
	private int mBorderOutsideColor = 0;
	// 内圆边框颜色
	private int mBorderInsideColor = 0;
	// RoundImageView控件默认的长、宽
	private int defaultWidth = 0;
	private int defaultHeight = 0;

	public RoundImageView(Context context) {
		super(context);
		mContext = context;
	}

	public RoundImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		mContext = context;
		// 设置RoundImageView的属性值，比如颜色，宽度等
		setRoundImageViewAttributes(attrs);
	}

	public RoundImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		mContext = context;
		setRoundImageViewAttributes(attrs);
	}

	// 从attr.xml文件中获取属性值，并给RoundImageView设置
	private void setRoundImageViewAttributes(AttributeSet attrs) {
		TypedArray a = mContext.obtainStyledAttributes(attrs, R.styleable.round_image_view);
		mBorderThickness = a.getDimensionPixelSize(R.styleable.round_image_view_border_width, 0);
		mBorderOutsideColor = a.getColor(R.styleable.round_image_view_border_outcolor, defaultColor);
		mBorderInsideColor = a.getColor(R.styleable.round_image_view_border_incolor, defaultColor);
		a.recycle();
	}

	// 具体解释：比如我自定义一个控件，怎么实现呢，以RoundImageView为例，首先是继承ImageView,然后实现其构造函数，在构造函数中，获取attr中的属性值（再次解释：这里获取的具体的这个属性的值是怎么来的呢？比如颜色和宽度，这个在attr.xml中定义了相关的名字，而在使用RoundImageView的xml布局文件中，我们会设置其值，这里需要用的值，就是从那里设置的），并设置在本控件中，然后继承onDraw方法，画出自己想要的图形或者形状即可。
	/**
	 * 这个是继承的父类的onDraw方法
	 * 
	 * onDraw和下面的方法不用管，基本和学习自定义没关系，就是实现怎么画圆的，你可以改变下面代码试着画三角形头像，哈哈
	 */
	@Override
	protected void onDraw(Canvas canvas) {
		Drawable drawable = getDrawable();
		if (drawable == null) {
			return;
		}
		if (getWidth() == 0 || getHeight() == 0) {
			return;
		}
		this.measure(0, 0);
		if (drawable.getClass() == NinePatchDrawable.class)
			return;
		Bitmap b = ((BitmapDrawable) drawable).getBitmap();
		Bitmap bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
		if (defaultWidth == 0) {
			defaultWidth = getWidth();
		}
		if (defaultHeight == 0) {
			defaultHeight = getHeight();
		}
		int radius = 0;
		// 这里的判断是如果内圆和外圆设置的颜色值不为空且不是默认颜色，就定义画两个圆框，分别为内圆和外圆边框
		if (mBorderInsideColor != defaultColor
				&& mBorderOutsideColor != defaultColor) {
			radius = (defaultWidth < defaultHeight ? defaultWidth
					: defaultHeight) / 2 - 2 * mBorderThickness;
			// 画内圆
			drawCircleBorder(canvas, radius + mBorderThickness / 2,
					mBorderInsideColor);
			// 画外圆
			drawCircleBorder(canvas, radius + mBorderThickness
					+ mBorderThickness / 2, mBorderOutsideColor);
		} else if (mBorderInsideColor != defaultColor
				&& mBorderOutsideColor == defaultColor) {// 这里的是如果内圆边框不为空且颜色值不是默认值，就画一个内圆的边框
			radius = (defaultWidth < defaultHeight ? defaultWidth
					: defaultHeight) / 2 - mBorderThickness;
			drawCircleBorder(canvas, radius + mBorderThickness / 2,
					mBorderInsideColor);
		} else if (mBorderInsideColor == defaultColor
				&& mBorderOutsideColor != defaultColor) {// 这里的是如果外圆边框不为空且颜色值不是默认值，就画一个外圆的边框
			radius = (defaultWidth < defaultHeight ? defaultWidth
					: defaultHeight) / 2 - mBorderThickness;
			drawCircleBorder(canvas, radius + mBorderThickness / 2,
					mBorderOutsideColor);
		} else {// 这种情况是没有设置属性颜色的情况下，即没有边框的情况
			radius = (defaultWidth < defaultHeight ? defaultWidth
					: defaultHeight) / 2;
		}
		Bitmap roundBitmap = getCroppedRoundBitmap(bitmap, radius);
		canvas.drawBitmap(roundBitmap, defaultWidth / 2 - radius, defaultHeight
				/ 2 - radius, null);
	}

	/**
	 * 获取裁剪后的圆形图片
	 * 
	 * @param bmp
	 * @param radius
	 *            半径
	 * @return
	 */
	public Bitmap getCroppedRoundBitmap(Bitmap bmp, int radius) {
		Bitmap scaledSrcBmp;
		int diameter = radius * 2;
		// 为了防止宽高不相等，造成圆形图片变形，因此截取长方形中处于中间位置最大的正方形图片
		int bmpWidth = bmp.getWidth();
		int bmpHeight = bmp.getHeight();
		int squareWidth = 0, squareHeight = 0;
		int x = 0, y = 0;
		Bitmap squareBitmap;
		if (bmpHeight > bmpWidth) {// 高大于宽
			squareWidth = squareHeight = bmpWidth;
			x = 0;
			y = (bmpHeight - bmpWidth) / 2;
			// 截取正方形图片
			squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
					squareHeight);
		} else if (bmpHeight < bmpWidth) {// 宽大于高
			squareWidth = squareHeight = bmpHeight;
			x = (bmpWidth - bmpHeight) / 2;
			y = 0;
			squareBitmap = Bitmap.createBitmap(bmp, x, y, squareWidth,
					squareHeight);
		} else {
			squareBitmap = bmp;
		}
		if (squareBitmap.getWidth() != diameter
				|| squareBitmap.getHeight() != diameter) {
			scaledSrcBmp = Bitmap.createScaledBitmap(squareBitmap, diameter,
					diameter, true);
		} else {
			scaledSrcBmp = squareBitmap;
		}
		Bitmap output = Bitmap.createBitmap(scaledSrcBmp.getWidth(),
				scaledSrcBmp.getHeight(), Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(output);

		Paint paint = new Paint();
		Rect rect = new Rect(0, 0, scaledSrcBmp.getWidth(),
				scaledSrcBmp.getHeight());

		paint.setAntiAlias(true);
		paint.setFilterBitmap(true);
		paint.setDither(true);
		canvas.drawARGB(0, 0, 0, 0);
		canvas.drawCircle(scaledSrcBmp.getWidth() / 2,
				scaledSrcBmp.getHeight() / 2, scaledSrcBmp.getWidth() / 2,
				paint);
		paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
		canvas.drawBitmap(scaledSrcBmp, rect, rect, paint);
		bmp = null;
		squareBitmap = null;
		scaledSrcBmp = null;
		return output;
	}

	/**
	 * 画边缘的圆，即内圆或者外圆
	 */
	private void drawCircleBorder(Canvas canvas, int radius, int color) {
		Paint paint = new Paint();
		/* 去锯齿 */
		paint.setAntiAlias(true);
		paint.setFilterBitmap(true);
		paint.setDither(true);
		paint.setColor(color);
		/* 设置paint的　style　为STROKE：空心 */
		paint.setStyle(Paint.Style.STROKE);
		/* 设置paint的外框宽度 */
		paint.setStrokeWidth(mBorderThickness);
		canvas.drawCircle(defaultWidth / 2, defaultHeight / 2, radius, paint);
	}

}
